limits question help please?

0 ⤊

lim x-9/sqrt(x) - 3 as x approaches 9

2007-09-04 20:34:02 · 2 answers · asked by 2789 2 in Science & Mathematics ➔ Mathematics

multiply it by (sqrt(x)+3)/(sqrt(x)+3)

or

factor the top: x-9 = (sqrt(x)+3)*(sqrt(x)-3)

2007-09-04 20:39:12 · answer #1 · answered by Demiurge42 7 · 0⤊ 0⤋

=lim (x-9)/(sqrt(x) - 3)
x->9
=lim (sqrt(x)-3)*(sqrt(x)+3)/(sqrt(x) - 3)
x->9
=lim (sqrt(x)+3)
x->9
=3+3
=6

2007-09-05 03:44:40 · answer #2 · answered by Lawrence M 2 · 0⤊ 0⤋